<template>
  <div class="login_container">
    <div class="login_box">
      <!--这是头像区域-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!--登录表单区域-->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" show-password prefix-icon="el-icon-lock"></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 这是登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 这是表单的验证规则对象
      loginFormRules: {
        username: [
          // trigger是验证表单的时期，blur表示失去焦点时
          { required: true, message: '用户名不能为空', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '密码不能为空', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const result = await this.$http.post('login', this.loginForm)
        if (result.data.meta.status === 200) {
          this.$message.success('登录成功')
          // 将登录成功之后的token保存到客户端的 sessionStorage 中（因为项目中的有些接口只能在登录后才能使用）
          window.sessionStorage.setItem('token', result.data.data.token)
          this.$router.push('/home')
        } else {
          this.$message({
            showClose: true,
            message: '登录失败',
            type: 'error'
          })
        }
        /* this.$message.error('登录失败') */
      })
      /* this.$refs.loginFormRef.validate(valid => {
        // 用的是不可关闭的消息提示
        if (valid) return this.$message.success('登录失败')
        this.$message.error('登录成功')
      }) */
    }
  }
}
</script>

<!--scoped表示只对当前组件起作用，不定义scoped的话，表示全局生效-->
<style lang="less" scoped>
.login_container{
  background-color: cadetblue;
  height: 100%;
}
.login_box{
  background-color: #fff;
  height:300px;
  width:450px;
  border-radius: 3px;
  top:50%;
  left:50%;
  transform: translate(-50%,-50%);
  position: absolute;
  .avatar_box{
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    background-color: #fff;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left:50%;
    transform: translate(-50%,-50%);
    img{
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}

.login_form{
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btns{
  display: flex;
  justify-content: flex-end;
}
</style>
